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Debt - Schedule of Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Jun. 30, 2018 | Nov. 30, 2014
--- | --- | --- | ---
Debt Instrument |  |  |  |
Total debt, gross |  | $ 2,250,000 | $ 2,250,000 |
Unamortized discount |  | (2,343) | (2,523) |
Unamortized debt issuance costs |  | (9,279) | (10,075) |
Total, net of discount |  | 2,238,378 | 2,237,402 |
Current portion of long-term debt |  | 249,996 | 0 |
Long-term debt |  | $ 1,988,382 | 2,237,402 |
Senior notes |  |  |  |
Debt Instrument |  |  |  |
Unamortized discount |  |  |  | $ (4,000)
Fixed-rate 3.375% Senior Notes due on November 1, 2019 | Senior notes |  |  |  |
Debt Instrument |  |  |  |
Stated interest rate |  | 3.375% |  |
Total debt, gross |  | $ 250,000 | $ 250,000 |
Effective interest rate |  | 3.377% | 3.377% |
Fixed-rate 4.125% Senior Notes due on November 1, 2021 | Senior notes |  |  |  |
Debt Instrument |  |  |  |
Stated interest rate |  | 4.125% |  |
Total debt, gross |  | $ 500,000 | $ 500,000 |
Effective interest rate |  | 4.128% | 4.128% |
Fixed-rate 4.650% Senior Notes due on November 1, 2024 | Senior notes |  |  |  |
Debt Instrument |  |  |  |
Stated interest rate | [1] | 4.65% |  |
Total debt, gross | [1] | $ 1,250,000 | $ 1,250,000 |
Effective interest rate | [1] | 4.682% | 4.682% |
Fixed-rate 5.650% Senior Notes due on November 1, 2034 | Senior notes |  |  |  |
Debt Instrument |  |  |  |
Stated interest rate |  | 5.65% |  |
Total debt, gross |  | $ 250,000 | $ 250,000 |
Effective interest rate |  | 5.67% | 5.67% |
Portion of senior notes | Cash flow hedge contracts - foreign currency | Senior notes | Treasury lock | Derivatives designated as hedging instruments |  |  |  |
Debt Instrument |  |  |  |
Effective percentage including treasury rate lock hedge |  | 4.626% |  |
[1] | The effective interest rate disclosed above for this series of Senior Notes excludes the impact of the treasury rate lock hedge discussed below. The effective interest rate including the impact of the treasury rate lock hedge was 4.626%.

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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